Stay-bolt.



E. W. CLARK. STAY BOLT. APPLICATION FILED JUNE 24, 1911.

1,029,104, Patented June 11, 1912.

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EDWARD w. organ. or LOS ANGELES, camroanm.

STAY-'IBOLT.

Specification of Letters Patent.

Application filed June 24, 1911. Serial No 635,141.

Patented June 11, 1912.

To all whom it may concern:

Be it known that I, EDWARD W. CLARK, a citizen of the United States, residing at vthe city of Los Angeles, county of Los 'Angeles, State of California, have invented new and useful Improvements in Stay-Bolts, of which the following is a specification.

My invention relates to stay bolts for securing the fire-box of a boiler to the head or shell thereof; and the object thereof is to provide a flexible stay-bolt which can be quickly and accurately secured in place, and which will make steam tight joints and, at the same time, allow the ordina'r'y vibration between the parts without any undue strain.

A further object is to produce a stay-bolt which may be positioned for use when the holes in the fire-box are not in perfect alinement.

Another object is to produce a stay-bolt which, when positioned for andin'use, will keep the scale and dirtout of the joints and will remain flexible until the boiler is worn out.

I accomplish these objects by the staybolt described herein and illustrated in the accompanying drawings, forming a. part hereof, in which: i

Figure 1 is a side elevation partly in section'of the parts of my bolt before being connected; Fig. 2 is a like view, with the parts. connected and partly positioned in the fire-box and shown; Figs. 3 and 4 are side elevations, partly in 'section of modified forms of my bolt, with the parts connectedmeady for use; Fig. 5 is a'modified form of the fire- In the drawings, 10 is the shaft or central portion shaft' is provided site surfaces 11 are preferably the frustum of a semi-globe. The other surfaces of said heads, consist preferably of a small central globe and will be termed the plane of the base of the spacer head to the outer -edge of the. head. The other end of the shaft has a like head. Upon one of the heads of the shaft is a tube or thimble 13 having a partition 14 therein, which divides into two parts or sockets, the

the 'thimble inner 15, and the outer 16. In the surface of the partition the inner socket '15 1s a shell, a fragment of each being.

tion like the of the bolt. In Figs. 1 and 2,'thewith heads whose oppo depression 17 of a configuration to receive the spacer head of the shaft. The outer edge. of the inner socket is preferably thicker than the other parts to give it greater strength when swaged upon the head of the shaft, as shown in Figs. 2 and 4. The external surface of the thimble is screwthreaded so that it may be screwed into the shell 18 of the boiler. The thimble hole 19 is internally screw-threaded for the recept1o-n of the thimble, and the hole preferably tapers outwardly so that after the thimble is positionedit may be externally expanded in the manner customary with boiler tubes and make a steam tight joint of great holding power. The fire-box end of my bolt preferably consists of the solid tapered externally threaded body 20, having a head 21 provided with a socket 22, intowhich is received the other end of the shaft. inner end surface of this socket has a depression 23 in which is received the spacer head of the other end of the shaft. The outer edgeof this head is also preferably reinforced. The fire-box shell 24 has a threaded hole 25 into which this end of the bolt is screwed when positioned for use. The inner end 26 of body 20 is preferably square for the reception of a wrench which is used when the-bolt is positioned.

In Fig. 3 I have shown the shaft 10 of my bolt terminating in sockets 27, which are swaged upon heads 28 and 29 of a configurahead of shaft 10 before described. In this form of bolt, the outer thimble has 'a head 29 which is received into the socket on the end of the shaft, and is held in place by having the 'walls of the socket swaged upon the head. This thimble has an annular flange 30 which,is swaged down upon the end of the socket after the socket is swaged upon the head to prevent scale and dirt entering the socket when in use and freezing the head to the socket. Th fire-box end of the bolt has a like head 28 as the outer thimbles head 29 and is connectedto the shaft in like manner.

In Fig. 4, the construction of the bolt is the same as in Figs; 1 and 2, except that the shaft is provided near each head with an "annular flange 31 which is swaged down upon the end of the socket after the socket is swaged upon the head to prevent scale and dirt entering the socket when in use and freezing the head to the socket. In positioning my bolt there .will be an operator The Y time, the outer man, with a proper tool,-

screws the outer thimble to its proper position in the outer shell of the boiler. It will be readily seen that the outer man can draw or push either the fire-box wall or outer shell at will. By having the entrance of the socket which incloses the head protected by a flange swaged down upon the end of the socket, all danger of scale or dirt entering or forming in the socket is prevented, and the parts are thereby prevented from freezing. By the use of my bolt, there is no danger of its breaking'by reason of the vibration between the fire-box and outer shell due to unequal expansion; and the fire-box and outer shell can be quickly and per-' fectly connected, even though the holes in the respective parts are somewhat out of alinement.

If the fire-box end shown in Fig. 5 is used," after the same is positioned, the inner end would be expanded by'the inner man, the same as a boiler tube, by the use of a suitable expander.

.Havlng described my invention, what I claim'is:

1. An improved flexible stay bolt,eon-

sisting of a shaft having heads and annular flanges near said heads; and end sections having sockets into which said heads are received and revolubly held by swaging said sockets upon said heads, said flanges being swaged down upon the ends of the sockets, said end sections being adapted to be secured in the outer shell and fire-box shell substan- 'tially as described.

2. An improved flexible stay bolt, consisting of a shaft having heads; a boiler shell section comprising an exteriorly threaded thimble having a artition therein, one end of said thimble belng swaged upon one head of the shaft to revolubl connect the thimble and shaft; and a fireox section comprising a body portion externally threaded and having in one end a socket into which is received and revolubly secured therein by swaging one head of the shaft.

3. An improved flexible stay-bolt consisting of sections adapted to be secured into the outer shell and fire-box shell; a con necting section revolubly connected to the outer shell and fire-box sections by swaging of some of the parts upon other of the parts, and a protective cover for the joints between the connecting and other sections.

In witness .that I claim the foregoing I have hereunto subscribed my name this 16th day of June, 1911.

EDWARD w. oLARK.

Witnesses:

G. E. HARrHAM, FRANK WATEBFIELD. 

